Date: Tue, 5 Oct 2010 21:26:49 GMT From: arundel@FreeBSD.org To: elias@pro.via-rs.com.br, arundel@FreeBSD.org, freebsd-bugs@FreeBSD.org Subject: Re: bin/18114: iostat(8): msps from iostat is wrong Message-ID: <201010052126.o95LQnnj050491@freefall.freebsd.org>
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Synopsis: iostat(8): msps from iostat is wrong
State-Changed-From-To: suspended->feedback
State-Changed-By: arundel
State-Changed-When: Tue Oct 5 21:05:01 UTC 2010
State-Changed-Why:
After some research in connection with this PR I believe it can be closed.
Revision r81134 (from Aug 2001) switched from compute_stats(3) to
devstat_compute_statistics(3). With this change a lot of 'real' kernel stats
could be accessed from within iostat(8). One of these stats is:
"
DSM_MS_PER_TRANSACTION_FREE type: long double *
The average duration of transactions of
the specified type between the acquisi-
tion of previous and current.
"
This means that 'msps' is now being derived from actual kernel stats and no
longer from 'tps'.
Since this is such an old PR and I'm not 100% sure I got this right, I'm keeping
it in feedback state until somebody can verify or falsify my assumption.
Cheers.
Alex
http://www.freebsd.org/cgi/query-pr.cgi?pr=18114
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